/**
 *    Copyright 2009-2015 the original author or authors.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
/**
 * TODO fillme.
 */
package org.apache.ibatis.logging;
//MyBatis的日志模块位于org.apache.ibatis.logging包中，通过适配器模式，实现了集成和复用常见的第三方日志组件。
// Mybatis支持多个第三方日志插件，优先级由低到高为slf4J、commonsLoging、Log4J2、Log4J和JdkLog等。

//日志模块的包结构，如下图所示。主要实现了对slf4J、commonsLoging、Log4J2、Log4J和JdkLog等第三方日志框架进行集成。
// 其中jdbc子包下主要是提供了一系列对JDBC操作过程中使用到的对象进行了封装代理，增加其日志功能。
